class Solution {
public:
    void rotate(vector<int>& nums, int k) {
        if (nums.empty() || (k %= nums.size()) == 0) return;
        int n = nums.size();
        reverse(nums.begin(), nums.begin() + n - k);
        reverse(nums.begin() + n - k, nums.end());
        reverse(nums.begin(), nums.end());
    }
};
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